To summarise, he said that
1) Two mid big size devs have no plans of supporting NX right now, but such things "can change pretty fast"
2) He has yet to meet with someone who tells him that they have NX dev kits / they plan on supporting it
3) He specified he has no infos from Japan
To be honest, I'd say that, between the "life-threatening" NDAs (a bit of an exaggeration on my part, but we know they're the tightest we've seen in a long time, with major consequences for those who can be traced as leakers...and it seems it's easy for Nintendo to track them), leaks ("official" or not) from other third parties, like Square/Namco and the uncertainty of EA (given the source's rumour), the fact that there's a game currently in beta and coming to NX, how we already know NX will support both Unity and Unreal Engine 4, and the existance of a scheduling for broad dev kits distribution as said by the third party Western developer who talked with Trevelyan...both IGC's tweets and Boogz's posts can be true at the same time. Simply, there are devs who have had dev kits for a long time (especialy Japanese), others who could have them but aren't allowed to even say they have them due to NDAs, others who don't have them for real and others who don't plan on supporting it RIGHT NOW, but things can easily change in the future (especially if tools make porting easy).